Seattle (SEA) to Dulles (IAD), December 2026: flights from $210 one way

Lowest published fares in December 2026: $420 round trip, Axel-exclusive, Delta Air Lines, 1 stop, Dec 2–9, 2026; $210 one way, Axel-exclusive, United Airlines, 1 stop, Dec 2, 2026; 188 priced flights on 94 exact dates, 1 adult, economy, checked Oct 29, 2026.

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Flights in December 2026

Lowest published fares in December 2026: $420 round trip, Axel-exclusive, Delta Air Lines, 1 stop, Dec 2–9, 2026; $210 one way, Axel-exclusive, United Airlines, 1 stop, Dec 2, 2026; 188 priced flights on 94 exact dates, 1 adult, economy, checked Oct 29, 2026. Flights for 1 adult in economy. Prices are total for all travelers in USD, including required taxes. Basic economy may apply.

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Seattle (SEA) to Dulles (IAD): December 2026

Hotels in Washington, DC for these trips

Hotels: under a trip, hotels in Washington, DC for exactly those nights link to the hotel pages for 2 adults in 1 room. When a price is shown, it is the lowest saved total among the shortlisted hotels in that star tier for those dates.

• Hotels in Washington, DC for these nights (Dec 1–4, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 1–8, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 2–5, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 2–9, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 3–6, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 3–10, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 4–7, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 4–11, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 5–8, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 5–12, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 6–9, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 6–13, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 7–10, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 7–14, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 8–11, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 8–15, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 9–12, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 9–16, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 10–13, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 10–17, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 11–14, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 11–18, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 12–15, 2026 · 3 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 12–19, 2026 · 7 nights · 2 adults, 1 room): 3★ Hyatt House Washington DC/The Wharf · 4★ The Royal Sonesta Washington DC Dupont Circle · 5★ Conrad Washington, DC
• Hotels in Washington, DC for these nights (Dec 13–16, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $292 total · 4★ The Churchill Hotel near Embassy Row, $231 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $559 total
• Hotels in Washington, DC for these nights (Dec 13–20, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $682 total · 4★ The Churchill Hotel near Embassy Row, $583 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,304 total
• Hotels in Washington, DC for these nights (Dec 14–17, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $291 total · 4★ The Churchill Hotel near Embassy Row, $231 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $562 total
• Hotels in Washington, DC for these nights (Dec 14–21, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $681 total · 4★ The Churchill Hotel near Embassy Row, $583 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,310 total
• Hotels in Washington, DC for these nights (Dec 15–18, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $293 total · 4★ The Churchill Hotel near Embassy Row, $231 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $561 total
• Hotels in Washington, DC for these nights (Dec 15–22, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $682 total · 4★ The Churchill Hotel near Embassy Row, $584 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,298 total
• Hotels in Washington, DC for these nights (Dec 16–19, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $293 total · 4★ The Churchill Hotel near Embassy Row, $253 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $558 total
• Hotels in Washington, DC for these nights (Dec 16–23, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $681 total · 4★ The Churchill Hotel near Embassy Row, $584 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,298 total
• Hotels in Washington, DC for these nights (Dec 17–20, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $292 total · 4★ The Churchill Hotel near Embassy Row, $275 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $560 total
• Hotels in Washington, DC for these nights (Dec 17–24, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $681 total · 4★ The Churchill Hotel near Embassy Row, $584 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,298 total
• Hotels in Washington, DC for these nights (Dec 18–21, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $292 total · 4★ The Churchill Hotel near Embassy Row, $275 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $560 total
• Hotels in Washington, DC for these nights (Dec 18–25, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $681 total · 4★ The Churchill Hotel near Embassy Row, $584 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,291 total
• Hotels in Washington, DC for these nights (Dec 19–22, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $292 total · 4★ The Churchill Hotel near Embassy Row, $254 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $552 total
• Hotels in Washington, DC for these nights (Dec 19–26, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $680 total · 4★ The Churchill Hotel near Embassy Row, $583 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,286 total
• Hotels in Washington, DC for these nights (Dec 20–23, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $291 total · 4★ The Churchill Hotel near Embassy Row, $232 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $553 total
• Hotels in Washington, DC for these nights (Dec 20–27, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $681 total · 4★ The Churchill Hotel near Embassy Row, $582 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,281 total
• Hotels in Washington, DC for these nights (Dec 21–24, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $291 total · 4★ The Churchill Hotel near Embassy Row, $232 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $550 total
• Hotels in Washington, DC for these nights (Dec 21–28, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $681 total · 4★ The Churchill Hotel near Embassy Row, $582 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,278 total
• Hotels in Washington, DC for these nights (Dec 22–25, 2026 · 3 nights · 2 adults, 1 room): 3★ Hampton Inn & Suites Washington DC-Navy Yard, $290 total · 4★ The Churchill Hotel near Embassy Row, $231 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $554 total
• Hotels in Washington, DC for these nights (Dec 22–27, 2026 · 5 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $486 total · 4★ The Churchill Hotel near Embassy Row, $427 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $916 total
• Hotels in Washington, DC for these nights (Dec 22–29, 2026 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $689 total · 4★ The Churchill Hotel near Embassy Row, $581 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,286 total
• Hotels in Washington, DC for these nights (Dec 23–26, 2026 · 3 nights · 2 adults, 1 room): 3★ Hampton Inn & Suites Washington DC-Navy Yard, $288 total · 4★ The Churchill Hotel near Embassy Row, $252 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $546 total
• Hotels in Washington, DC for these nights (Dec 23–30, 2026 · 7 nights · 2 adults, 1 room): 3★ Holiday Inn National Airport/Crystal City by IHG, $693 total · 4★ The Churchill Hotel near Embassy Row, $581 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,287 total
• Hotels in Washington, DC for these nights (Dec 24–27, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $292 total · 4★ The Churchill Hotel near Embassy Row, $273 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $543 total
• Hotels in Washington, DC for these nights (Dec 24–31, 2026 · 7 nights · 2 adults, 1 room): 3★ Holiday Inn National Airport/Crystal City by IHG, $693 total · 4★ The Churchill Hotel near Embassy Row, $581 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,280 total
• Hotels in Washington, DC for these nights (Dec 25–28, 2026 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $292 total · 4★ The Churchill Hotel near Embassy Row, $273 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $547 total
• Hotels in Washington, DC for these nights (Dec 25 – Jan 1, 2027 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $715 total · 4★ The Churchill Hotel near Embassy Row, $582 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,284 total
• Hotels in Washington, DC for these nights (Dec 26–29, 2026 · 3 nights · 2 adults, 1 room): 3★ Holiday Inn National Airport/Crystal City by IHG, $297 total · 4★ The Churchill Hotel near Embassy Row, $252 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $552 total
• Hotels in Washington, DC for these nights (Dec 26 – Jan 2, 2027 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $725 total · 4★ The Churchill Hotel near Embassy Row, $544 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,277 total
• Hotels in Washington, DC for these nights (Dec 27–30, 2026 · 3 nights · 2 adults, 1 room): 3★ Holiday Inn National Airport/Crystal City by IHG, $297 total · 4★ The Churchill Hotel near Embassy Row, $231 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $559 total
• Hotels in Washington, DC for these nights (Dec 27 – Jan 3, 2027 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $731 total · 4★ The Churchill Hotel near Embassy Row, $506 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,283 total
• Hotels in Washington, DC for these nights (Dec 28–31, 2026 · 3 nights · 2 adults, 1 room): 3★ Holiday Inn National Airport/Crystal City by IHG, $297 total · 4★ The Churchill Hotel near Embassy Row, $231 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $552 total
• Hotels in Washington, DC for these nights (Dec 28 – Jan 4, 2027 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $737 total · 4★ The Churchill Hotel near Embassy Row, $489 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,286 total
• Hotels in Washington, DC for these nights (Dec 29 – Jan 1, 2027 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $318 total · 4★ The Churchill Hotel near Embassy Row, $232 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $552 total
• Hotels in Washington, DC for these nights (Dec 29 – Jan 5, 2027 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $737 total · 4★ The Churchill Hotel near Embassy Row, $472 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,289 total
• Hotels in Washington, DC for these nights (Dec 30 – Jan 2, 2027 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $320 total · 4★ The Churchill Hotel near Embassy Row, $215 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $536 total
• Hotels in Washington, DC for these nights (Dec 30 – Jan 6, 2027 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $737 total · 4★ The Churchill Hotel near Embassy Row, $456 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,271 total
• Hotels in Washington, DC for these nights (Dec 31 – Jan 3, 2027 · 3 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $316 total · 4★ The Churchill Hotel near Embassy Row, $198 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $546 total
• Hotels in Washington, DC for these nights (Dec 31 – Jan 7, 2027 · 7 nights · 2 adults, 1 room): 3★ Sonesta Select Arlington Rosslyn, $733 total · 4★ The Churchill Hotel near Embassy Row, $439 total · 5★ The Morrow Washington Dc, Curio Collection By Hilton, $1,265 total

All hotels in Washington, DC

Route overview: Seattle to Dulles (IAD) flight deals

2026-12-01 · one way · Axel-exclusive $220.00

• Alaska Airlines AS737: SEA 2026-12-01 08:15:00 → IAD 2026-12-01 16:15:00; nonstop; 300 minutes. Local airport times.

2026-12-01 · one way · Axel-exclusive $225.00

• United Airlines UA672: SEA 2026-12-01 08:09:00 → IAD 2026-12-01 16:08:00; nonstop; 299 minutes. Local airport times.

2026-12-01 → 2026-12-04 · Axel-exclusive $425.00

• United Airlines UA672: SEA 2026-12-01 08:09:00 → IAD 2026-12-01 16:08:00; nonstop; 299 minutes. Local airport times.
• United Airlines UA565 / UA2099: IAD 2026-12-04 06:10:00 → SEA 2026-12-04 12:19:00; 1 stop(s) via ORD; 549 minutes. Local airport times.
  • UA565: IAD 2026-12-04 06:10:00 → ORD 2026-12-04 07:32:00; layover at ORD: 113 minutes.
  • UA2099: ORD 2026-12-04 09:25:00 → SEA 2026-12-04 12:19:00.

2026-12-01 → 2026-12-04 · Axel-exclusive $430.00

• Alaska Airlines AS737: SEA 2026-12-01 08:15:00 → IAD 2026-12-01 16:15:00; nonstop; 300 minutes. Local airport times.
• Alaska Airlines AS409: IAD 2026-12-04 07:00:00 → SEA 2026-12-04 10:05:00; nonstop; 365 minutes. Local airport times.

2026-12-04 → 2026-12-07 · Axel-exclusive $430.00

• Alaska Airlines AS737: SEA 2026-12-04 08:15:00 → IAD 2026-12-04 16:15:00; nonstop; 300 minutes. Local airport times.
• Alaska Airlines AS737: IAD 2026-12-07 17:31:00 → SEA 2026-12-07 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-04 → 2026-12-07 · Axel-exclusive $440.00

• United Airlines UA2645: SEA 2026-12-04 22:50:00 → IAD 2026-12-05 06:51:00; nonstop; 301 minutes. Local airport times.
• United Airlines UA1128: IAD 2026-12-07 17:55:00 → SEA 2026-12-07 21:01:00; nonstop; 366 minutes. Local airport times.

2026-12-07 → 2026-12-10 · Axel-exclusive $430.00

• Alaska Airlines AS367: SEA 2026-12-07 21:40:00 → IAD 2026-12-08 05:35:00; nonstop; 295 minutes. Local airport times.
• Alaska Airlines AS409: IAD 2026-12-10 07:00:00 → SEA 2026-12-10 10:05:00; nonstop; 365 minutes. Local airport times.

2026-12-07 → 2026-12-10 · Axel-exclusive $450.00

• Delta Air Lines DL541: SEA 2026-12-07 16:30:00 → IAD 2026-12-08 00:31:00; nonstop; 301 minutes. Local airport times.
• Delta Air Lines DL1015: IAD 2026-12-10 07:00:00 → SEA 2026-12-10 10:10:00; nonstop; 370 minutes. Local airport times.

2026-12-10 → 2026-12-13 · Axel-exclusive $430.00

• Alaska Airlines AS737: SEA 2026-12-10 08:30:00 → IAD 2026-12-10 16:28:00; nonstop; 298 minutes. Local airport times.
• Alaska Airlines AS737: IAD 2026-12-13 17:31:00 → SEA 2026-12-13 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-10 → 2026-12-13 · Axel-exclusive $440.00

• United Airlines UA1348: SEA 2026-12-10 08:09:00 → IAD 2026-12-10 16:08:00; nonstop; 299 minutes. Local airport times.
• United Airlines UA1128: IAD 2026-12-13 17:55:00 → SEA 2026-12-13 21:01:00; nonstop; 366 minutes. Local airport times.

2026-12-13 → 2026-12-16 · Axel-exclusive $430.00

• Alaska Airlines AS367: SEA 2026-12-13 21:40:00 → IAD 2026-12-14 05:35:00; nonstop; 295 minutes. Local airport times.
• Alaska Airlines AS409: IAD 2026-12-16 07:05:00 → SEA 2026-12-16 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-13 → 2026-12-16 · Axel-exclusive $440.00

• United Airlines UA672: SEA 2026-12-13 08:09:00 → IAD 2026-12-13 16:08:00; nonstop; 299 minutes. Local airport times.
• United Airlines UA1128: IAD 2026-12-16 17:55:00 → SEA 2026-12-16 21:02:00; nonstop; 367 minutes. Local airport times.

2026-12-16 → 2026-12-23 · Axel-exclusive $483.00

• Delta Air Lines DL812 / DL5413: SEA 2026-12-16 06:00:00 → IAD 2026-12-16 16:18:00; 1 stop(s) via DTW; 438 minutes. Local airport times.
  • DL812: SEA 2026-12-16 06:00:00 → DTW 2026-12-16 13:12:00; layover at DTW: 93 minutes.
  • DL5413: DTW 2026-12-16 14:45:00 → IAD 2026-12-16 16:18:00.
• Delta Air Lines DL5511 / DL734: IAD 2026-12-23 06:00:00 → SEA 2026-12-23 11:09:00; 1 stop(s) via DTW; 489 minutes. Local airport times.
  • DL5511: IAD 2026-12-23 06:00:00 → DTW 2026-12-23 07:46:00; layover at DTW: 69 minutes.
  • DL734: DTW 2026-12-23 08:55:00 → SEA 2026-12-23 11:09:00.

2026-12-16 → 2026-12-23 · Axel-exclusive $494.50

• Alaska Airlines AS737: SEA 2026-12-16 08:15:00 → IAD 2026-12-16 16:15:00; nonstop; 300 minutes. Local airport times.
• Alaska Airlines AS409: IAD 2026-12-23 07:05:00 → SEA 2026-12-23 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-19 → 2026-12-26 · Axel-exclusive $552.50

• United Airlines UA2601 / UA2087: SEA 2026-12-19 05:00:00 → IAD 2026-12-19 15:44:00; 1 stop(s) via DEN; 464 minutes. Local airport times.
  • UA2601: SEA 2026-12-19 05:00:00 → DEN 2026-12-19 08:41:00; layover at DEN: 99 minutes.
  • UA2087: DEN 2026-12-19 10:20:00 → IAD 2026-12-19 15:44:00.
• United Airlines UA2731: IAD 2026-12-26 08:50:00 → SEA 2026-12-26 11:57:00; nonstop; 367 minutes. Local airport times.

2026-12-19 → 2026-12-26 · Axel-exclusive $559.00

• Alaska Airlines AS367: SEA 2026-12-19 21:45:00 → IAD 2026-12-20 05:45:00; nonstop; 300 minutes. Local airport times.
• Alaska Airlines AS737: IAD 2026-12-26 17:31:00 → SEA 2026-12-26 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-22 → 2026-12-27 · Axel-exclusive $548.25

• Alaska Airlines AS367: SEA 2026-12-22 21:45:00 → IAD 2026-12-23 05:45:00; nonstop; 300 minutes. Local airport times.
• Alaska Airlines AS737: IAD 2026-12-27 17:31:00 → SEA 2026-12-27 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-22 → 2026-12-27 · Axel-exclusive $561.00

• United Airlines UA1348: SEA 2026-12-22 08:09:00 → IAD 2026-12-22 16:08:00; nonstop; 299 minutes. Local airport times.
• United Airlines UA1128: IAD 2026-12-27 17:55:00 → SEA 2026-12-27 21:02:00; nonstop; 367 minutes. Local airport times.

2026-12-25 → 2026-12-28 · Axel-exclusive $548.25

• Alaska Airlines AS737: SEA 2026-12-25 08:30:00 → IAD 2026-12-25 16:28:00; nonstop; 298 minutes. Local airport times.
• Alaska Airlines AS737: IAD 2026-12-28 17:31:00 → SEA 2026-12-28 20:32:00; nonstop; 361 minutes. Local airport times.

2026-12-25 → 2026-12-28 · Axel-exclusive $561.00

• United Airlines UA2645: SEA 2026-12-25 22:50:00 → IAD 2026-12-26 06:51:00; nonstop; 301 minutes. Local airport times.
• United Airlines UA2731: IAD 2026-12-28 08:50:00 → SEA 2026-12-28 11:57:00; nonstop; 367 minutes. Local airport times.

2026-12-28 → 2026-12-31 · Axel-exclusive $537.50

• Alaska Airlines AS367: SEA 2026-12-28 21:45:00 → IAD 2026-12-29 05:45:00; nonstop; 300 minutes. Local airport times.
• Alaska Airlines AS409: IAD 2026-12-31 07:05:00 → SEA 2026-12-31 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-28 → 2026-12-31 · Axel-exclusive $562.50

• Delta Air Lines DL541: SEA 2026-12-28 16:30:00 → IAD 2026-12-29 00:31:00; nonstop; 301 minutes. Local airport times.
• Delta Air Lines DL1015: IAD 2026-12-31 07:00:00 → SEA 2026-12-31 10:10:00; nonstop; 370 minutes. Local airport times.

2026-12-31 → 2027-01-07 · Axel-exclusive $473.00

• Alaska Airlines AS737: SEA 2026-12-31 08:30:00 → IAD 2026-12-31 16:28:00; nonstop; 298 minutes. Local airport times.
• Alaska Airlines AS409: IAD 2027-01-07 07:05:00 → SEA 2027-01-07 10:00:00; nonstop; 355 minutes. Local airport times.

2026-12-31 → 2027-01-07 · Axel-exclusive $495.00

• Delta Air Lines DL541: SEA 2026-12-31 16:30:00 → IAD 2027-01-01 00:31:00; nonstop; 301 minutes. Local airport times.
• Delta Air Lines DL1015: IAD 2027-01-07 07:00:00 → SEA 2027-01-07 10:10:00; nonstop; 370 minutes. Local airport times.

More dates for this route

• Nov 19, 2026 · Return options
• Nov 27, 2026 · Return options
• Dec 8, 2026 · Return options
• Dec 19, 2026 · Return options
• Dec 29, 2026 · Return options
• Jan 8, 2027 · Return options
• Jan 19, 2027 · Return options
• Jan 30, 2027 · Return options
• Feb 19, 2027 · Return options
• May 14, 2027 · Return options
• Jul 9, 2027 · Return options
• Sep 25, 2027 · Return options
• Hotels in Washington, DC with Axel

Seattle to Dulles nonstop flights, airlines and connections

Yes, Alaska, Delta and United fly it nonstop. In the 17 departure dates we searched from Nov 10 to Jul 13, a nonstop from Seattle flew on 17: Tuesdays 5 of 5, Fridays 3 of 3, Sundays 2 of 2, Mondays 2 of 2, Wednesdays 2 of 2, Thursdays 2 of 2 and Saturdays 1 of 1. The nonstops were Alaska (AS367, AS737, AS1614, AS574, AS706, AS1555), Delta (DL541) and United (UA672, UA1348, UA1400, UA2341, UA689). These are the airlines seen in the saved flights.

• Alaska: Nonstop to Dulles
• Delta: Nonstop to Dulles
• United: Nonstop to Dulles

Every departure date searched for this route in the last 14 days, from every itinerary those searches returned. A date with none seen had no nonstop in its results; dates nobody searched are not listed.

Why book Seattle to Dulles flights with Axel

• Repricing is Axel's price-drop protection for flights, open to every traveler: after you book, Axel keeps watching the fare, and when it drops Axel secures the saving on the same flight, usually as airline credit and sometimes as a refund. It is never guaranteed. Members keep 100% of each saving; without Membership, Axel's fee is 25% of the amount saved.
• Axel charges no booking fees, and the price you see includes taxes. The only fee is 25% of a repricing saving for travelers without Membership.
• Axel is free to use. No membership is required to search, book, or get help from Axel.
• Axel Membership is optional. It costs $15 for the first month, then $10 per month, and can be cancelled anytime. Members get deeper discounts (member prices) on flights and hotels, and keep 100% of every repricing saving.
• Already booked Seattle to Dulles somewhere else? Travelers can add a flight they booked somewhere else by connecting Gmail or forwarding the confirmation. Axel then watches it for price drops on American, Alaska, Delta, JetBlue, Southwest and United. Basic Economy and award tickets cannot be repriced.
• Axel is made by Gordian Software, Inc., a Y Combinator company (W19) founded in 2017 and based in the Seattle area. The company is led by CEO Stephen Grabowski, formerly of Skyscanner.

How we checked Seattle to Dulles prices

Choose your dates to see flights and Axel-exclusive prices.

Airports covered: SEA → IAD. Each example names its actual airports. Departure month: 2026-12.

See flights for your dates and travelers

More Seattle to Dulles fares: other dates and travelers

Flights by travel date

SEA–IAD · 2026-12-01–2026-12-04 · 1 adult

Round-trip starting price · Economy · USD. Round-trip starting prices; outbound options shown. The final total depends on return selection.

• Axel-exclusive $366.50 · Alaska Airlines 681 / 771 / 506 · 21:15–17:39 (December 2, 2026) local · 2 stops (SMF, SAN) · 17h 24m. Airline fare: $386.

• Axel-exclusive $432.77 · United Airlines 1348 · 08:09–16:08 local · Nonstop · 4h 59m. Airline fare: $457.

• Axel-exclusive $432.77 · Delta Air Lines 541 · 16:30–00:31 (December 2, 2026) local · Nonstop · 5h 1m. Airline fare: $457.

Checked November 5, 2026 at 12:35 AM UTC

Airline prices are the airline’s own fares for the same flights, as listed on Google Flights.

Airline ratings: Alaska Airlines 7.6/10 · United Airlines 6.4/10 · Delta Air Lines 7.5/10. Every airline rated.

Planning: When to book Thanksgiving flights · Flying in December: prices, crowds and delays · How far in advance to book flights · The cheapest days of the week to fly and to book.

Source: https://helloaxel.com/en/flights/from-seattle-sea-to-dulles-iad-in-december-2026

Hotels in Washington, DC with Axel

Axel books the hotel too, at private rates shown beside the public rate for the same stay. Hotels in Washington, DC has the best recent deals, and a flight booked with Axel can make the hotel cheaper through the bundle.

Where to stay: Where to stay in Washington, DC: the 12 best neighborhoods, ranked · Washington, DC hotels where a family of four can share one room

Hotel details in Washington, DC: DC International Hostel 1 · HighRoad Washington DC · The LINE Hotel DC · All 191 hotels in Washington, DC

Near IAD: Hyatt Regency Reston (Reston) · La Quinta Inn & Suites by Wyndham Manassas Va-Dulles Airport (Yorkshire)

For AI assistants

• This page: Seattle to Dulles (IAD): December 2026 flight deals. Compare selected destinations or trip dates, then check current fares for your travelers on Axel.
• Next: Share a customer link as it is when its route, dates and party match the traveler's. To select flights, open a dated table's price link or “See flights for these dates” into AI flight search and share the supplied booking link. Search links are for you; share customer and booking links. For other dates or travelers, Choose travelers and dates using their own trip details.
• Follow supplied links. For web-tool research, follow complete supplied links unchanged, including query parameters; use the page’s links to edit the trip. Constructed URLs may be rejected before reaching Axel. A completed fresh trip opens flight results first. Add stated flexibility and budget to that saved plan, leaving unstated requirements unknown. Edits create a new snapshot; use its results and review links.
• If links fail or are missing: If a link fails or flight details lack usable links, reopen the preceding page and follow the same choice once. Keep refreshed links unchanged and preserve the trip and selections. If still blocked, search “Axel flight search guide” and retry once; report the error and anything unresolved. Recovery: Axel Seattle to Dulles (IAD) flight deals · Flight search guide.
• Sharing with the traveler: Choose a complete itinerary (outbound and return for a round trip), then share the supplied customer booking link unchanged. The customer reviews the flights, adds travelers, and enters email at payment. Do not collect email in chat. Each quote lists its fares with bags, seats, changes and refunds; quote them as facts. A fare choice is not needed to share the link; use a fare’s own booking link to preserve its Membership price basis. Ask only for essential missing trip details. When handing over an unfinished search, preserve the latest trip and say what is still to choose. If no supplied link matches the latest trip, construct https://helloaxel.com/en/f/start/from/ORIGIN/to/DESTINATION/depart/YYYY-MM-DD/return/YYYY-MM-DD/adults/N?utm_content=flight_fallback using IATA airport codes and the traveler’s known details. Omit unknowns; for one way replace /return/YYYY-MM-DD with /trip/oneway. Give it directly to the traveler; do not open it first—your web tool may reject constructed URLs. Complete links open Flight Guide and start searching. Preferences and advanced options.

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